Tool-holder.



e. T. Ems. TOOL HOLDER. v AI'IBLIOA'IJH HI FILED APR. 13,1908.

Patented May 11, 1909.

3' Inventor Witnsses: (EM/ME uslim.

UNITE STAT Tl? nrrcn,

GEORGE T. nurse, or HAMILTON, 01110, AssIGNoR TO NILES-BEMENT-PONDCOMPANY, or

Jnasnrorrnnnw JERSEY. r

TOOL-HOLDER..

Specification of Letters Patent.

Patented May 11, 1909.

Application filed April 13, 1908. Serial No. 426,731.

Fig. 2 a horizontal-section of the same: and

Fig. 3 a vertical longitudinalsection of the same.

suited for the support of a tool and adapted to be united with thetool-carryingmember of a machinetool, the carriage ofa lathe, forinstance: 2, the tool resting thereon: 3,

an arch extending from the basepiece up over thetool: 4, the clampingscrew disposed vertically in the arch, which screw would, in ordinarycases, have its lower end impinging upon the tool orupon a shimon thetop of the tool: 5, a pair of pivots dis posed across the arch over andat right angles to the tool: 6, a lever mounted on each pivot, the endsof these two levers projecting inwardly to a point near each other andunder the screw: 7, a downwardly presenting thrust-surface carried bythis screw above the inner ends of the levers, this thrust-surface beingpreferably convex: 8, a washer loosely carried by the screw between thethrustsurface 7 and the inner ends of the levers, this washer beingfreely supported by the screw and having a concave upper surfaceengaging the convex thrust-surface of the screw: 9, a shim dis posedbetween the tool and the levers: 10, a collar carried by the screw, andadapted to engage below the inner ends of the levers:

and 11, side-stops pivoted in the sides of In the drawing :1, indicatesa base-piece causes the intermediate portions of the levers topowerfully grip the tool, and the possible rocking of the washer uponthe convex thrustsurface of the screw permits. of some degree ofequalization of the pressure exerted by the individual levers in case ofdifferential movement on their part. flhe collar l0 lifts upwardly uponthe levers and releases the tool when the screw; is run upwardly. In thecase illustratedthe levers, areso short as to take on the form of cams,resulting in a very considerable gripping power applied at the twopoints on the tool and by means of a structure of marked compactness.

The clamping movement of the levers is small and slow and the shim 9facilitates the clamping pressure sufiicient to permit of the shim beingwithdrawn, whereupon the tool may be withdrawn rearwardlynotwithstanding the elevation of its nose.

In the construction illustrated the tool, instead of resting directlyupon the top of the base-piece, rests upon a shoe separately insertedtherein, which feature of construction will be recognized as a mereexpedient for providing the base-piece with a tool-bearing surface ofspecially desirable material and of renewable character.

I claim e 1. A tool holder comprising, a base-piece adapted for thesupport of a tool, a topmember carried thereby above the tool, a screwengaging the top-member and having a thrust-surface presenting towardthe basepiece, a pair of pivots disposed parallel witheach other acrossthe top member and over the tool and on opposite sides of the axis ofthe screw, and levers mounted on said pivots and having intermediateportions adapted for clamping effect upon the tool and having their endsprojecting inwardly under the thrustsurface of the screw, combinedsubstantially as set forth.

2; A tool holder comprising, a base-piece adapted for the support of atool, a topmember carried thereby above the tool, a screw engaging thetop-member and having a convex thrustsurface presenting toward thebase-piece, a pair of pivots disposed parallel with each other acrossthe top-memof the axis of the screw, levers mounted on said pivots andhaving intermediate portions adapted for clamping effect upon the tooland having their ends projecting inwardly under the thrust-surface ofthe screw, and a collar loosely carried by said screw and engaging overthe inner ends of said leversand having a concave upper surface engagingthe convex-thrust-surface of the screw, combined substantially assetforth.

3. A tool holder comprising, a base-piece adapted for the support of atool, a topmember carried thereby above the tool, a screw engaging thetop-member and having a thrust-surface presenting toward the basepiece,a pair of pivots disposed parallel with each other across the top-memberand over the tool and on opposite sides of the axis of the screw, leversmounted on said pivots and having intermediate portions adapted forclamping effect upon the tool and having their ends projecting inwardlyunder the tln'ust-surface of the screw, and a collar carried by saidscrew and adapted for upward engagement with the inner ends of saidlevers, combined substantially as set forth.

4. A tool holder comprising, a basepiece adapted for the support of atool, a topmember carried thereby above the tool, a pair of pivotsdisposed parallel with each other across the top-member and over thetool, inwardly projecting levers mounted on said pivots andhavingintermediate portions adapted for clamping effect upon the tool,and a pressure-producing device carried by said top-member and adaptedfor downward action upon the ends of said levers, combined substantiallyas set forth.

5. The combination of a frame, a tool therein, two levers separatelypivoted in the frame and adapted to clamp the tool and a screw adaptedto act upon both levers and serving to urge them to clamping position.

(5. The combination of a frame, a tool therein, tvvo levers separatelypivoted in the frame and adapted to clamp the tool, a screw adapted toact upon both levers and serving to urge them to clamping position, anda member carried by the screw and adapted for up ard engagement of thelevers, to support and retract them when the screw is reversely rotated.

T. The combination of a frame, a. tool therein, two levers separatelypivoted in the frame and having faces adapted to clamp the tool, anequalizer engaging the levers and a screw mounted in the frame andengaging the equalizer. V

GEORGE 'l. REISS. lVituesses:

lioumrr B. l\l1LLI KIN, M. S. Bunnmv.

